A. octane number
B. cetane number
C. calorific value
D. carbon content
E. ignition temperature
Ignition quality of diesel-fuel oil is expressed by an index called__________________? Read More »
I.C. Engines A. auto ignition
B. preignition
C. retarded ignition
D. accelerated ignition
E. detonation
A. instantaneous auto-ignition of last part of charge to be burnt
B. improper mixing of air and fuel
C. improper combustion
D. self ignition temperature has nothing to do with detonation
E. none of the above
According to Recardo’s theory, detonation occurs due to______________________? Read More »
I.C. Engines A. enhanced by increasing compression ratio
B. enhanced by decreasing compression ratio
C. unaflected by compression ratio
D. first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed
E. dependent on other factors
The knocking in diesel engines for given fuel, will be__________________? Read More »
I.C. Engines A. the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature
B. time before actual fuel injection and the pump pluger starts to pump fuel
C. time corresponding to actual injection and top dead center
D. time corresponding to actual ignition and top dead center
E. none of the above
Injection lag is_________________? Read More »
I.C. Engines A. 1%
B. 0.5%
C. 0.1%
D. 0.01%
E. 0.001%
Carbon residue in diesel oil should not be more than___________________? Read More »
I.C. Engines A. not true
B. true at full load
C. true at part load
D. true at both part and full load
E. there could not be any such criterion
A. low temperature
B. low density
C. long ignition delay
D. rich mixture
E. all of the above
A. high temperature
B. high density
C. short delay
D. reactive mixture
E. all of the above
A. reduce cost
B. improve surface finish
C. prevent clogging
D. reduce wear and eliminate scuffing
E. improve heat transfer
